body{
	padding: 50px;
}

.poster_main{
	width: 1000px;
	height: 300px;
	position: relative;
}

.poster_list{
	width: 100%;
	height: 100%;
	position: relative;
	list-style-type: none;
}

.poster_item img{
	width: 100%;
	height: 100%;
}

.btn{
	position: relative;
	height: 100%;
	opacity: 0;
}

.btn img{
	opacity: 0.5;
}

.prebtn{
	position: absolute;
	top: 0px;
	left: 0px;
}

.nextbtn{
	position: absolute;
	top: 0px;
	right: 0px;
}
